<?php
/**
 *--------------------------------------------------------------------
 *
 * Sub-Class - Code 11
 *
 *--------------------------------------------------------------------
 * Copyright (C) Jean-Sebastien Goupil
 * http://www.barcodephp.com
 */
include_once('BCGBarcode1D.php');

class BCGcode11 extends BCGBarcode1D {
	/**
	 * Constructor.
	 */
	public function __construct() {
		parent::__construct();

		$this->keys = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-');
		$this->code = array(	// 0 added to add an extra space
			'000010',	/* 0 */
			'100010',	/* 1 */
			'010010',	/* 2 */
			'110000',	/* 3 */
			'001010',	/* 4 */
			'101000',	/* 5 */
			'011000',	/* 6 */
			'000110',	/* 7 */
			'100100',	/* 8 */
			'100000',	/* 9 */
			'001000'	/* - */
		);
	}

	/**
	 * Draws the barcode.
	 *
	 * @param resource $im
	 */
	public function draw($im) {
		// Starting Code
		$this->drawChar($im, '001100', true);

		// Chars
		$c = strlen($this->text);
		for ($i = 0; $i < $c; $i++) {
			$this->drawChar($im, $this->findCode($this->text[$i]), true);
		}

		// Checksum
		$this->calculateChecksum();
		$c = count($this->checksumValue);
		for ($i = 0; $i < $c; $i++) {
			$this->drawChar($im, $this->code[$this->checksumValue[$i]], true);
		}

		// Ending Code
		$this->drawChar($im, '00110', true);
		$this->drawText($im);
	}

	/**
	 * Returns the maximal size of a barcode.
	 *
	 * @return int[]
	 */
	public function getMaxSize() {
		$p = parent::getMaxSize();

		$w = 0;
		$c = strlen($this->text);
		for ($i = 0; $i < $c; $i++) {
			$index = $this->findIndex($this->text[$i]);
			if ($index !== false) {
				$w += 6;
				$w += substr_count($this->code[$index], '1');
			}
		}

		$startlength = 8 * $this->scale;
		$textlength = $w * $this->scale;

		// We take the max length possible for checksums (it is 7 or 8...)
		$checksumlength = 8 * $this->scale;
		if ($c >= 10) {
			$checksumlength += 8 * $this->scale;
		}

		$endlength = 7 * $this->scale;
		return array($p[0] + $startlength + $textlength + $checksumlength + $endlength, $p[1]);
	}

	/**
	 * Validates the input.
	 */
	protected function validate() {
		$c = strlen($this->text);
		if($c === 0) {
			throw new BCGParseException('code11', 'No data has been entered.');
		}

		// Checking if all chars are allowed
		for ($i = 0; $i < $c; $i++) {
			if (array_search($this->text[$i], $this->keys) === false) {
				throw new BCGParseException('code11', 'The character \'' . $this->text[$i] . '\' is not allowed.');
			}
		}

		parent::validate();
	}

	/**
	 * Overloaded method to calculate checksum.
	 */
	protected function calculateChecksum() {
		// Checksum
		// First CheckSUM "C"
		// The "C" checksum character is the modulo 11 remainder of the sum of the weighted
		// value of the data characters. The weighting value starts at "1" for the right-most
		// data character, 2 for the second to last, 3 for the third-to-last, and so on up to 20.
		// After 10, the sequence wraps around back to 1.

		// Second CheckSUM "K"
		// Same as CheckSUM "C" but we count the CheckSum "C" at the end
		// After 9, the sequence wraps around back to 1.
		$sequence_multiplier = array(10, 9);
		$temp_text = $this->text;
		$this->checksumValue = array();
		for ($z = 0; $z < 2; $z++) {
			$c = strlen($temp_text);

			// We don't display the K CheckSum if the original text had a length less than 10
			if ($c <= 10 && $z === 1) {
				break;
			}

			$checksum = 0;
			for ($i = $c, $j = 0; $i > 0; $i--, $j++) {
				$multiplier = $i % $sequence_multiplier[$z];
				if ($multiplier === 0) {
					$multiplier = $sequence_multiplier[$z];
				}

				$checksum += $this->findIndex($temp_text[$j]) * $multiplier;
			}

			$this->checksumValue[$z] = $checksum % 11;
			$temp_text .= $this->keys[$this->checksumValue[$z]];
		}
	}

	/**
	 * Overloaded method to display the checksum.
	 */
	protected function processChecksum() {
		if ($this->checksumValue === false) { // Calculate the checksum only once
			$this->calculateChecksum();
		}

		if ($this->checksumValue !== false) {
			$ret = '';
			$c = count($this->checksumValue);
			for ($i = 0; $i < $c; $i++) {
				$ret .= $this->keys[$this->checksumValue[$i]];
			}

			return $ret;
		}

		return false;
	}
}
?>